Trying to capture a machine's screen and broadcast it to our NVR unit. Reason being so we can watch for setting changes and audit what is going wrong when it breaks down. I cant find much of anything to accomplish this and a software solution isnt an option as many of the machines are old DOS based systems.

Knowing nothing about the inner workings of an IP camera my first thought would be hack one of the many cheap IP camera's and use its hardware to broadcast an alternate video feed rather than its lens input.